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TH30C

Sensibly equivalent to:
302THA
    
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The TH30C is a triode heptode frequency changer that dates to 1939. The triode oscillator requires 9.5 mA whereas the 1937 TH22C takes 22.5 mA of oscillator current. Both have the same pin-out and mixer sections are equivalent. These mixers are designed for 200 mA series heater chains.
The suppressor grid g5 is internally connected to the cathode. The triode grid is internally connected to g3 of the heptode.
The reverse is plain gold coloured metal loaded paint.
The wide glass tube envelope is 35 mm in diameter and, excluding the B7 base pins, is 134 mm tall.
References: Datasheet & 1043. Type TH30C was first introduced in 1939.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
a(t)
g1(t),g3
g2,g4
h
h
m,k
a
g1

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
29.0
0.2
250
100
-2.5
3.25
6.0
1.5M
0.75

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
9.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 24, 2018.
shape:wide.glass.tube construction:pinch type:triode.heptode age:1930.1940 base:b7 heater:200ma pins:7 pin:1.a(t) pin:2.g1(t).g3 pin:3.g2.g4 pin:4.h pin:5.h pin:6.m.k pin:7.a pin:tc.g1
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